preadmission

Adjective

 * 1) Before admission (to a hospital, university, etc.).

Noun

 * 1) A preadmission process; a process that precedes admission.
 * 2)  A preliminary process that precedes hospital admission for some interventional or surgical procedures.
 * 3) Admission, as of steam, to an engine cylinder before the backstroke is completed, thus increasing the cushioning.